Go to main content

man pages section 8: System Administration Commands

Exit Print View

Updated: Thursday, June 13, 2019
 
 

smartctl (8)

Name

smartctl - Control and Monitor Utility for SMART Disks

Synopsis

smartctl [options] device

Description

SMARTCTL(8)                 SMART Monitoring Tools                 SMARTCTL(8)



NAME
       smartctl - Control and Monitor Utility for SMART Disks


SYNOPSIS
       smartctl [options] device


DESCRIPTION
       [This  man  page is generated for the Solaris version of smartmontools.
       It does not contain info specific to other platforms.]

       smartctl controls the Self-Monitoring, Analysis and Reporting  Technol-
       ogy  (SMART)  system  built into most ATA/SATA and SCSI/SAS hard drives
       and solid-state drives.  The purpose of SMART is to monitor the  relia-
       bility  of  the hard drive and predict drive failures, and to carry out
       different types of drive self-tests.  smartctl also supports some  fea-
       tures  not  related  to  SMART.  This version of smartctl is compatible
       with ACS-3, ACS-2, ATA8-ACS, ATA/ATAPI-7  and  earlier  standards  (see
       REFERENCES below).

       smartctl also provides support for polling TapeAlert messages from SCSI
       tape drives and changers.

       The user must specify the device to be controlled  or  interrogated  as
       the  final  argument to smartctl. The command set used by the device is
       often derived from the device path but may  need  help  with  the  '-d'
       option (for more information see the section on "ATA, SCSI command sets
       and SAT" below). Device paths are as follows:

       SOLARIS: Use the forms "/dev/rdsk/c?t?d?s?" for IDE/ATA and  SCSI  disk
                devices, and "/dev/rmt/*" for SCSI tape devices.

       if  '-'  is specified as the device path, smartctl reads and interprets
       it's own debug output from standard input.  See '-r ataioctl' below for
       details.

       Based  on  the device path, smartctl will guess the device type (ATA or
       SCSI).  If necessary, the '-d' option can  be  used  to  override  this
       guess

       Note that the printed output of smartctl displays most numerical values
       in base 10 (decimal), but some values are displayed in base  16  (hexa-
       decimal).  To distinguish them, the base 16 values are always displayed
       with a leading "0x", for example: "0xff". This  man  page  follows  the
       same convention.


OPTIONS
       The  options  are grouped below into several categories.  smartctl will
       execute  the  corresponding  commands  in   the   order:   INFORMATION,
       ENABLE/DISABLE, DISPLAY DATA, RUN/ABORT TESTS.


       SHOW INFORMATION OPTIONS:

       -h, --help, --usage
              Prints a usage message to STDOUT and exits.

       -V, --version, --copyright, --license
              Prints  version,  copyright, license, home page and SVN revision
              information for your copy of smartctl to STDOUT and then  exits.
              Please  include  this  information  if you are reporting bugs or
              problems.

       -i, --info
              Prints the device model number, serial number, firmware version,
              and  ATA  Standard  version/revision  information.   Says if the
              device supports SMART, and if so, whether SMART support is  cur-
              rently  enabled  or  disabled.   If  the device supports Logical
              Block Address mode (LBA mode) print current user drive  capacity
              in bytes. (If drive is has a user protected area reserved, or is
              "clipped", this may be smaller than the potential maximum  drive
              capacity.)  Indicates if the drive is in the smartmontools data-
              base (see '-v' options below).  If so, the  drive  model  family
              may also be printed. If '-n' (see below) is specified, the power
              mode of the drive is printed.

       --identify[=[w][nvb]]
              [ATA only] Prints an annotated  table  of  the  IDENTIFY  DEVICE
              data.   By  default, only valid words (words not equal to 0x0000
              or 0xffff) and nonzero bits and bit fields  are  printed.   This
              can be changed by the optional argument which consists of one or
              two characters from the set 'wnvb'.  The character  'w'  enables
              printing of all 256 words. The character 'n' suppresses printing
              of bits, 'v' enables printing of all bits from valid words,  'b'
              enables printing of all bits.  For example '--identify=n' (valid
              words, no bits) produces the shortest output and '--identify=wb'
              (all words, all bits) produces the longest output.

       -a, --all
              Prints all SMART information about the disk, or TapeAlert infor-
              mation about the tape drive or changer.  For ATA devices this is
              equivalent to
              '-H -i -c -A -l error -l selftest -l selective'
              and for SCSI, this is equivalent to
              '-H -i -A -l error -l selftest'.
              Note  that  for  ATA  disks  this  does not enable the non-SMART
              options and the SMART options which require support  for  48-bit
              ATA commands.

       -x, --xall
              Prints all SMART and non-SMART information about the device. For
              ATA devices this is equivalent to
              '-H -i -g all -c -A -f brief -l xerror,error -l xselftest,selftest
              -l selective -l directory -l scttemp -l scterc -l devstat -l sataphy'.
              and for SCSI, this is equivalent to
              '-H -i -A -l error -l selftest -l background -l sasphy'.

       --scan Scans for devices and prints each device name, device  type  and
              protocol  ([ATA]  or  [SCSI])  info.  May be used in conjunction
              with '-d TYPE' to restrict the scan to  a  specific  TYPE.   See
              also info about platform specific device scan and the DEVICESCAN
              directive on smartd(8) man page.

       --scan-open
              Same as --scan, but also tries to open each device before print-
              ing device info.  The device open may change the device type due
              to autodetection (see also '-d test').

              This option can be used to create a draft smartd.conf file.  All
              options  after '--' are appended to each output line.  For exam-
              ple:
              smartctl --scan-open -- -a -W 4,45,50 -m admin@work > smartd.conf

              [NEW EXPERIMENTAL SMARTCTL FEATURE] Multiple '-d  TYPE'  options
              may  be  specified  with  '--scan[-open]'  to  combine  the scan
              results of more than one TYPE.

       -g NAME, --get=NAME
              Get non-SMART device settings.  See '-s, --set' below  for  fur-
              ther info.


       RUN-TIME BEHAVIOR OPTIONS:

       -q TYPE, --quietmode=TYPE
              Specifies that smartctl should run in one of the two quiet modes
              described here.  The valid arguments to this option are:

              errorsonly - only print: For the '-l error' option, if  nonzero,
              the  number  of  errors  recorded in the SMART error log and the
              power-on time when they occurred; For the '-l selftest'  option,
              errors  recorded  in  the  device  self-test  log;  For the '-H'
              option, SMART "disk failing" status or device  Attributes  (pre-
              failure  or  usage)  which failed either now or in the past; For
              the '-A' option, device Attributes (pre-failure or usage)  which
              failed either now or in the past.

              silent  - print no output.  The only way to learn about what was
              found is to use the exit status of  smartctl  (see  EXIT  STATUS
              below).

              noserial - Do not print the serial number of the device.

       -d TYPE, --device=TYPE
              Specifies  the  type of the device.  The valid arguments to this
              option are:

              auto - attempt to guess the device type from the device name  or
              from  controller  type  info provided by the operating system or
              from a matching USB ID entry in the drive database.  This is the
              default.

              test - prints the guessed type, then opens the device and prints
              the (possibly changed) TYPE name and then  exists  without  per-
              forming any further commands.

              ata - the device type is ATA.  This prevents smartctl from issu-
              ing SCSI commands to an ATA device.

              scsi - the device type is SCSI.   This  prevents  smartctl  from
              issuing ATA commands to a SCSI device.

              sat[,auto][,N]  -  the  device  type  is SCSI to ATA Translation
              (SAT).  This is for ATA disks that have a SCSI to  ATA  Transla-
              tion  (SAT) Layer (SATL) between the disk and the operating sys-
              tem.  SAT defines two ATA PASS THROUGH  SCSI  commands,  one  12
              bytes  long  and the other 16 bytes long.  The default is the 16
              byte variant which can be overridden with either '-d sat,12'  or
              '-d sat,16'.

              If  '-d  sat,auto'  is  specified, device type SAT (for ATA/SATA
              disks) is only used if the SCSI  INQUIRY  data  reports  a  SATL
              (VENDOR:  "ATA     ").  Otherwise device type SCSI (for SCSI/SAS
              disks) is used.

              usbcypress - this device type is for ATA disks that are behind a
              Cypress USB to PATA bridge.  This will use the ATACB proprietary
              scsi pass through command.  The default SCSI operation  code  is
              0x24,  but  although  it  can  be  overridden  with  '-d  usbcy-
              press,0xN', where N is the scsi operation code,  you're  running
              the risk of damage to the device or filesystems on it.

              usbjmicron[,p][,x][,PORT]  -  this device type is for SATA disks
              that are behind a JMicron USB to PATA/SATA bridge.   The  48-bit
              ATA  commands  (required e.g. for '-l xerror', see below) do not
              work with all of these bridges and  are  therefore  disabled  by
              default.   These  commands  can be enabled by '-d usbjmicron,x'.
              If two disks are connected to a bridge with two ports, an  error
              message  is  printed  if  no PORT is specified.  The port can be
              specified by '-d usbjmicron[,x],PORT' where PORT is  0  (master)
              or  1  (slave).  This is not necessary if the device uses a port
              multiplier to connect multiple disks to  one  port.   The  disks
              appear  under separate /dev/ice names then.  CAUTION: Specifying
              ',x' for a device which does  not  support  it  results  in  I/O
              errors  and  may  disconnect the drive.  The same applies if the
              specified PORT does not exist or is not connected to a disk.

              The Prolific PL2507/3507 USB bridges with older firmware support
              a pass-through command similar to JMicron and work with '-d usb-
              jmicron,0'.  Newer Prolific firmware requires a modified command
              which can be selected by '-d usbjmicron,p'.  Note that this does
              not yet support the SMART status command.

              usbprolific - [NEW EXPERIMENTAL SMARTCTL  FEATURE]  this  device
              type   is   for   SATA   disks   that   are  behind  a  Prolific
              PL2571/2771/2773/2775 USB to SATA bridge.

              usbsunplus - this device type is for SATA disks that are  behind
              a SunplusIT USB to SATA bridge.


       -T TYPE, --tolerance=TYPE
              [ATA  only] Specifies how tolerant smartctl should be of ATA and
              SMART command failures.

              The behavior of smartctl depends upon  whether  the  command  is
              "optional"  or  "mandatory". Here "mandatory" means "required by
              the ATA Specification if the device implements the SMART command
              set" and "optional" means "not required by the ATA Specification
              even if the device  implements  the  SMART  command  set."   The
              "mandatory" ATA and SMART commands are: (1) ATA IDENTIFY DEVICE,
              (2)  SMART  ENABLE/DISABLE   ATTRIBUTE   AUTOSAVE,   (3)   SMART
              ENABLE/DISABLE, and (4) SMART RETURN STATUS.

              The valid arguments to this option are:

              normal  -  exit  on  failure of any mandatory SMART command, and
              ignore all failures of optional SMART  commands.   This  is  the
              default.   Note  that  on  some  devices,  issuing unimplemented
              optional SMART commands doesn't cause an error.  This can result
              in  misleading  smartctl  messages such as "Feature X not imple-
              mented", followed shortly by "Feature X: enabled".  In most such
              cases, contrary to the final message, Feature X is not enabled.

              conservative - exit on failure of any optional SMART command.

              permissive  -  ignore  failure(s)  of  mandatory SMART commands.
              This option may be given more than once.  Each additional use of
              this  option  will  cause  one  more  additional  failure  to be
              ignored.  Note that the use of this option can lead to  messages
              like  "Feature  X not supported", followed shortly by "Feature X
              enable failed".  In a few such cases, contrary to the final mes-
              sage, Feature X is enabled.

              verypermissive - equivalent to giving a large number of '-T per-
              missive' options: ignore failures of  any  number  of  mandatory
              SMART commands.  Please see the note above.

       -b TYPE, --badsum=TYPE
              [ATA only] Specifies the action smartctl should take if a check-
              sum error is detected in the: (1) Device Identity Structure, (2)
              SMART  Self-Test Log Structure, (3) SMART Attribute Value Struc-
              ture, (4) SMART Attribute Threshold Structure, or (5) ATA  Error
              Log Structure.

              The valid arguments to this option are:

              warn  -  report  the incorrect checksum but carry on in spite of
              it.  This is the default.

              exit - exit smartctl.

              ignore - continue silently without issuing a warning.

       -r TYPE, --report=TYPE
              Intended primarily to help smartmontools  developers  understand
              the  behavior  of smartmontools on non-conforming or poorly con-
              forming hardware.   This  option  reports  details  of  smartctl
              transactions  with  the device.  The option can be used multiple
              times.  When used just once, it shows a record  of  the  ioctl()
              transactions  with  the  device.   When used more than once, the
              detail of these ioctl() transactions  are  reported  in  greater
              detail.  The valid arguments to this option are:

              ioctl - report all ioctl() transactions.

              ataioctl - report only ioctl() transactions with ATA devices.

              scsiioctl  - report only ioctl() transactions with SCSI devices.
              Invoking this once shows the SCSI commands in hex and the corre-
              sponding status. Invoking it a second time adds a hex listing of
              the first 64 bytes of data send to, or received from the device.

              Any argument may include a positive integer to specify the level
              of  detail that should be reported.  The argument should be fol-
              lowed by a comma then the integer with no spaces.  For  example,
              ataioctl,2  The  default  level is 1, so '-r ataioctl,1' and '-r
              ataioctl' are equivalent.

              For testing purposes, the output of '-r ataioctl,2' can later be
              parsed  by  smartctl  itself if '-' is used as device path argu-
              ment.  The ATA command input parameters, sector data and  return
              values  are reconstructed from the debug report read from stdin.
              Then smartctl internally simulates an ATA device with  the  same
              behaviour. This is does not work for SCSI devices yet.

       -n POWERMODE, --nocheck=POWERMODE
              [ATA  only]  Specifies if smartctl should exit before performing
              any checks when the device is in a low-power  mode.  It  may  be
              used to prevent a disk from being spun-up by smartctl. The power
              mode is ignored by default.  A nonzero exit status  is  returned
              if  the  device  is in one of the specified low-power modes (see
              EXIT STATUS below).

              Note: If this option is used it may also be necessary to specify
              the  device type with the '-d' option.  Otherwise the device may
              spin up due to commands issued during device type autodetection.

              The valid arguments to this option are:

              never - check the device always, but print  the  power  mode  if
              '-i' is specified.

              sleep - check the device unless it is in SLEEP mode.

              standby  -  check  the  device  unless it is in SLEEP or STANDBY
              mode.  In these modes most disks are not  spinning,  so  if  you
              want  to  prevent a disk from spinning up, this is probably what
              you want.

              idle - check the device unless it is in SLEEP, STANDBY  or  IDLE
              mode.  In the IDLE state, most disks are still spinning, so this
              is probably not what you want.


       SMART FEATURE ENABLE/DISABLE COMMANDS:

              Note: if multiple options are used to both enable and disable  a
              feature,  then  both  the  enable  and  disable commands will be
              issued.  The enable command will always  be  issued  before  the
              corresponding disable command.

       -s VALUE, --smart=VALUE
              Enables  or  disables  SMART  on device.  The valid arguments to
              this option are on and off.  Note that the command '-s on' (per-
              haps  used  with with the '-o on' and '-S on' options) should be
              placed in a start-up script for your  machine,  for  example  in
              rc.local  or rc.sysinit. In principle the SMART feature settings
              are preserved over power-cycling, but  it  doesn't  hurt  to  be
              sure. It is not necessary (or useful) to enable SMART to see the
              TapeAlert messages.

       -o VALUE, --offlineauto=VALUE
              [ATA only] Enables or disables  SMART  automatic  offline  test,
              which  scans  the  drive every four hours for disk defects. This
              command can be given during normal system operation.  The  valid
              arguments to this option are on and off.

              Note  that the SMART automatic offline test command is listed as
              "Obsolete" in every version of the ATA and ATA/ATAPI  Specifica-
              tions.   It  was  originally  part of the SFF-8035i Revision 2.0
              specification, but was never  part  of  any  ATA  specification.
              However  it  is  implemented  and used by many vendors.  You can
              tell if automatic offline testing is supported by seeing if this
              command  enables and disables it, as indicated by the 'Auto Off-
              line Data Collection' part  of  the  SMART  capabilities  report
              (displayed with '-c').

              SMART  provides  three  basic  categories of testing.  The first
              category, called "online" testing, has no effect on the  perfor-
              mance of the device.  It is turned on by the '-s on' option.

              The second category of testing is called "offline" testing. This
              type of test can, in principle, degrade the device  performance.
              The  '-o  on'  option  causes this offline testing to be carried
              out, automatically, on a regular scheduled basis.  Normally, the
              disk will suspend offline testing while disk accesses are taking
              place, and then automatically resume it when the disk would oth-
              erwise  be idle, so in practice it has little effect.  Note that
              a one-time offline test can also be carried out immediately upon
              receipt  of  a user command.  See the '-t offline' option below,
              which causes a one-time offline test to be carried  out  immedi-
              ately.

              The choice (made by the SFF-8035i and ATA specification authors)
              of the word testing for these first two categories  is  unfortu-
              nate,  and  often  leads  to confusion.  In fact these first two
              categories of online and offline testing could  have  been  more
              accurately described as online and offline data collection.

              The results of this automatic or immediate offline testing (data
              collection) are reflected in the values of the SMART Attributes.
              Thus,  if  problems  or errors are detected, the values of these
              Attributes will go below their failure thresholds; some types of
              errors may also appear in the SMART error log. These are visible
              with the '-A' and '-l error' options respectively.

              Some SMART attribute values are  updated  only  during  off-line
              data  collection  activities; the rest are updated during normal
              operation of the device or during both normal operation and off-
              line  testing.   The  Attribute value table produced by the '-A'
              option indicates this in the UPDATED column.  Attributes of  the
              first  type  are  labeled "Offline" and Attributes of the second
              type are labeled "Always".

              The third category of testing (and the only category  for  which
              the  word  'testing'  is really an appropriate choice) is "self"
              testing.  This third type of test  is  only  performed  (immedi-
              ately)  when  a  command to run it is issued.  The '-t' and '-X'
              options can be used to carry  out  and  abort  such  self-tests;
              please see below for further details.

              Any  errors  detected  in  the self testing will be shown in the
              SMART self-test log, which can be examined using the  '-l  self-
              test' option.

              Note: in this manual page, the word "Test" is used in connection
              with the second category just described, e.g. for the  "offline"
              testing.   The words "Self-test" are used in connection with the
              third category.

       -S VALUE, --saveauto=VALUE
              [ATA] Enables or disables SMART autosave of  device  vendor-spe-
              cific  Attributes. The valid arguments to this option are on and
              off.  Note that this feature  is  preserved  across  disk  power
              cycles, so you should only need to issue it once.

              The  ATA  standard  does  not  specify a method to check whether
              SMART autosave is enabled.  Unlike  SCSI  (below),  smartctl  is
              unable to print a warning if autosave is disabled.

              [SCSI]  For  SCSI  devices  this toggles the value of the Global
              Logging Target Save Disabled (GLTSD) bit  in  the  Control  Mode
              Page. Some disk manufacturers set this bit by default. This pre-
              vents error counters, power-up hours and other useful data  from
              being  placed  in  non-volatile  storage, so these values may be
              reset to zero the next time the device is power-cycled.  If  the
              GLTSD bit is set then 'smartctl -a' will issue a warning. Use on
              to clear the GLTSD bit and thus enable saving counters  to  non-
              volatile  storage. For extreme streaming-video type applications
              you might consider using off to set the GLTSD bit.

       -g NAME, --get=NAME, -s NAME[,VALUE], --set=NAME[,VALUE]
              Gets/sets non-SMART device  settings.   Note  that  the  '--set'
              option shares its short option '-s' with '--smart'.  Valid argu-
              ments are:

              all - Gets all values. This is equivalent to
              '-g aam -g apm -g lookahead -g security -g wcache'

              aam[,N|off] - [ATA only] Gets/sets the Automatic  Acoustic  Man-
              agement  (AAM)  feature (if supported).  A value of 128 sets the
              most quiet (slowest) mode and 254 the  fastest  (loudest)  mode,
              'off'  disables  AAM.   Devices may support intermediate levels.
              Values below 128 are defined as vendor specific (0)  or  retired
              (1  to 127).  Note that the AAM feature was declared obsolete in
              ATA ACS-2 Revision 4a (Dec 2010).

              apm[,N|off] - [ATA only] Gets/sets the Advanced Power Management
              (APM)  feature  on  device (if supported).  If a value between 1
              and 254 is provided, it will attempt to enable APM and  set  the
              specified  value,  'off' disables APM.  Note the actual behavior
              depends on the drive, for example some  drives  disable  APM  if
              their  value is set above 128.  Values below 128 are supposed to
              allow drive spindown, values 128 and  above  adjust  only  head-
              parking  frequency, although the actual behavior defined is also
              vendor-specific.

              lookahead[,on|off] - [ATA only] Gets/sets  the  read  look-ahead
              feature  (if  supported).  Read look-ahead is usually enabled by
              default.

              security - [ATA only] Gets the status of  ATA  Security  feature
              (if supported).  If ATA Security is enabled an ATA user password
              is set.  The drive will be locked on next reset then.

              security-freeze - [ATA only] Sets ATA Security feature to frozen
              mode.   This  prevents  that the drive accepts any security com-
              mands until next reset.  Note that the frozen mode  may  already
              be set by BIOS or OS.

              standby,[N|off]  -  [ATA only] Sets the standby (spindown) timer
              and places the drive in the IDLE mode.  A value of  0  or  'off'
              disables  the standby timer.  Values from 1 to 240 specify time-
              outs from 5 seconds to 20 minutes in 5 second increments.   Val-
              ues from 241 to 251 specify timeouts from 30 minutes to 330 min-
              utes in 30 minute increments.  Value 252 specifies  21  minutes.
              Value  253  specifies  a  vendor  specific time between 8 and 12
              hours.  Value 255 specifies 21 minutes  and  15  seconds.   Some
              drives  may use a vendor specific interpretation for the values.
              Note that there is no get option because ATA  standards  do  not
              specify a method to read the standby timer.

              standby,now  -  [ATA only] Places the drive in the STANDBY mode.
              This usually spins down the drive.  The setting of  the  standby
              timer is not affected.

              wcache[,on|off]  - [ATA] Gets/sets the volatile write cache fea-
              ture (if supported).  The write  cache  is  usually  enabled  by
              default.

              wcache[,on|off]  -  [SCSI]  Gets/sets  the  'Write Cache Enable'
              (WCE) bit (if supported).  The write cache is usually enabled by
              default.

              wcreorder[,on|off]  -  [ATA only] Gets/sets Write Cache Reorder-
              ing.  If it is disabled (off), disk write scheduling is executed
              on  a first-in-first-out (FIFO) basis. If Write Cache Reordering
              is enabled (on), then disk write scheduling may be reordered  by
              the  drive.  If write cache is disabled, the current Write Cache
              Reordering state is remembered but has no effect  on  non-cached
              writes,  which  are  always  written in the order received.  The
              state of Write Cache Reordering has no effect on either  NCQ  or
              LCQ queued commands.

              rcache[,on|off] - [SCSI only] Gets/sets the 'Read Cache Disable'
              (RCE) bit.  'Off' value disables read cache (if supported).  The
              read cache is usually enabled by default.


       SMART READ AND DISPLAY DATA OPTIONS:

       -H, --health
              Prints the health status of the device or pending TapeAlert mes-
              sages.

              If the device reports failing health status, this  means  either
              that the device has already failed, or that it is predicting its
              own failure within the next 24 hours.  If this happens, use  the
              '-a'  option  to get more information, and get your data off the
              disk and to someplace safe as soon as you can.

              [ATA] Health status is obtained by checking the (boolean) result
              returned  by  the SMART RETURN STATUS command.  The return value
              of this ATA command may be unknown due to limitations or bugs in
              some layer (e.g. RAID controller or USB bridge firmware) between
              disk and operating system.  In  this  case,  smartctl  prints  a
              warning  and checks whether any Prefailure SMART Attribute value
              is less than or equal to its threshold (see '-A' below).

              [SCSI] Health status is  obtained  by  checking  the  Additional
              Sense Code (ASC) and Additional Sense Code Qualifier (ASCQ) from
              Informal Exceptions (IE) log page  (if  supported)  and/or  from
              SCSI sense data.

              [SCSI  tape  drive  or  changer] TapeAlert status is obtained by
              reading the TapeAlert log page.  Please note that the  TapeAlert
              log  page  flags  are cleared for the initiator when the page is
              read.  This means that each alert  condition  is  reported  only
              once  by  smartctl for each initiator for each activation of the
              condition.

       -c, --capabilities
              [ATA] Prints only the generic SMART  capabilities.   These  show
              what  SMART  features  are  implemented  and how the device will
              respond to some of the different SMART commands.  For example it
              shows  if the device logs errors, if it supports offline surface
              scanning, and so on.  If the device can  carry  out  self-tests,
              this  option also shows the estimated time required to run those
              tests.

              Note that the time required to run  the  Self-tests  (listed  in
              minutes)  are fixed.  However the time required to run the Imme-
              diate Offline Test (listed in seconds) is variable.  This  means
              that if you issue a command to perform an Immediate Offline test
              with the '-t offline' option, then the time may jump to a larger
              value  and then count down as the Immediate Offline Test is car-
              ried out.  Please see REFERENCES below for  further  information
              about the the flags and capabilities described by this option.

       -A, --attributes
              [ATA]  Prints  only  the  vendor specific SMART Attributes.  The
              Attributes are numbered from 1 to 253 and  have  specific  names
              and ID numbers. For example Attribute 12 is "power cycle count":
              how many times has the disk been powered up.

              Each Attribute has a "Raw"  value,  printed  under  the  heading
              "RAW_VALUE",  and a "Normalized" value printed under the heading
              "VALUE".  [Note: smartctl prints these values in  base-10.]   In
              the  example  just given, the "Raw Value" for Attribute 12 would
              be the actual number of times that  the  disk  has  been  power-
              cycled,  for example 365 if the disk has been turned on once per
              day for exactly one year.  Each vendor uses their own  algorithm
              to convert this "Raw" value to a "Normalized" value in the range
              from 1 to 254.  Please keep in mind that smartctl  only  reports
              the  different  Attribute  types, values, and thresholds as read
              from the device.  It does not carry out the  conversion  between
              "Raw"  and  "Normalized"  values:  this  is  done  by the disk's
              firmware.

              The conversion from Raw value to a quantity with physical  units
              is  not specified by the SMART standard. In most cases, the val-
              ues printed by smartctl are sensible.  For example the  tempera-
              ture Attribute generally has its raw value equal to the tempera-
              ture in Celsius.  However in some cases vendors use unusual con-
              ventions.  For example the Hitachi disk on my laptop reports its
              power-on hours in minutes, not hours. Some IBM disks track three
              temperatures rather than one, in their raw values.  And so on.

              Each  Attribute  also has a Threshold value (whose range is 0 to
              255) which is printed under the heading "THRESH".  If  the  Nor-
              malized value is less than or equal to the Threshold value, then
              the Attribute is said to have failed.  If  the  Attribute  is  a
              pre-failure Attribute, then disk failure is imminent.

              Each  Attribute also has a "Worst" value shown under the heading
              "WORST".  This is the smallest (closest to failure)  value  that
              the disk has recorded at any time during its lifetime when SMART
              was enabled.  [Note however that some vendors firmware may actu-
              ally   increase   the   "Worst"   value   for  some  "rate-type"
              Attributes.]

              The Attribute table printed  out  by  smartctl  also  shows  the
              "TYPE"  of  the  Attribute.  Attributes  are one of two possible
              types: Pre-failure or Old age.  Pre-failure Attributes are  ones
              which, if less than or equal to their threshold values, indicate
              pending disk failure.  Old age, or usage  Attributes,  are  ones
              which  indicate end-of-product life from old-age or normal aging
              and wearout, if the Attribute value is less than or equal to the
              threshold.   Please  note: the fact that an Attribute is of type
              'Pre-fail' does not mean that your disk is about  to  fail!   It
              only  has  this  meaning  if  the Attribute's current Normalized
              value is less than or equal to the threshold value.

              If the Attribute's current Normalized  value  is  less  than  or
              equal to the threshold value, then the "WHEN_FAILED" column will
              display "FAILING_NOW". If not, but the worst recorded  value  is
              less than or equal to the threshold value, then this column will
              display "In_the_past".  If the "WHEN_FAILED" column has no entry
              (indicated  by  a  dash: '-') then this Attribute is OK now (not
              failing) and has also never failed in the past.

              The table column labeled "UPDATED" shows if the SMART  Attribute
              values  are  updated  during  both normal operation and off-line
              testing, or only during offline testing.  The former are labeled
              "Always" and the latter are labeled "Offline".

              So  to  summarize:  the  Raw  Attribute values are the ones that
              might have a real physical interpretation, such as  "Temperature
              Celsius",  "Hours",  or  "Start-Stop Cycles".  Each manufacturer
              converts these, using their detailed  knowledge  of  the  disk's
              operations  and failure modes, to Normalized Attribute values in
              the range 1-254.  The current and  worst  (lowest  measured)  of
              these  Normalized Attribute values are stored on the disk, along
              with a Threshold value that the manufacturer has determined will
              indicate that the disk is going to fail, or that it has exceeded
              its design age or aging limit.  smartctl does not calculate  any
              of the Attribute values, thresholds, or types, it merely reports
              them from the SMART data on the device.

              Note that starting with ATA/ATAPI-4, revision 4, the meaning  of
              these  Attribute  fields has been made entirely vendor-specific.
              However most newer ATA/SATA disks seem to respect their meaning,
              so we have retained the option of printing the Attribute values.

              Solid-state  drives  use  different  meanings  for  some  of the
              attributes.  In this case the attribute name printed by smartctl
              is  incorrect  unless  the drive is already in the smartmontools
              drive database.

              [SCSI] For SCSI devices the "attributes" are obtained  from  the
              temperature and start-stop cycle counter log pages. Certain ven-
              dor specific attributes are listed if recognised. The attributes
              are  output  in a relatively free format (compared with ATA disk
              attributes).

       -f FORMAT, --format=FORMAT
              [ATA only] Selects the output format of the attributes:

              old - Old smartctl format. This is the default unless  the  '-x'
              option is specified.

              brief  -  New  format  which fits into 80 colums (except in some
              rare cases).  This format also decodes four additional attribute
              flags.  This is the default if the '-x' option is specified.

              hex,id - Print all attribute IDs as hexadecimal numbers.

              hex,val - Print all normalized values as hexadecimal numbers.

              hex - Same as '-f hex,id -f hex,val'.

       -l TYPE, --log=TYPE
              Prints  either the SMART Error Log, the SMART Self-Test Log, the
              SMART Selective Self-Test Log [ATA only], the Log Directory [ATA
              only],  or  the  Background  Scan  Results Log [SCSI only].  The
              valid arguments to this option are:

              error - [ATA] prints the Summary SMART error log.   SMART  disks
              maintain  a  log of the most recent five non-trivial errors. For
              each of these errors, the disk power-on lifetime  at  which  the
              error  occurred  is  recorded,  as  is  the device status (idle,
              standby, etc) at the time of the error.  For some  common  types
              of errors, the Error Register (ER) and Status Register (SR) val-
              ues are decoded and printed as text. The meanings of these are:
                 ABRT:  Command ABoRTed
                 AMNF:  Address Mark Not Found
                 CCTO:  Command Completion Timed Out
                 EOM:   End Of Media
                 ICRC:  Interface Cyclic Redundancy Code (CRC) error
                 IDNF:  IDentity Not Found
                 ILI:   (packet command-set specific)
                 MC:    Media Changed
                 MCR:   Media Change Request
                 NM:    No Media
                 obs:   obsolete
                 TK0NF: TracK 0 Not Found
                 UNC:   UNCorrectable Error in Data
                 WP:    Media is Write Protected
              In addition, up to the last  five  commands  that  preceded  the
              error are listed, along with a timestamp measured from the start
              of the corresponding power cycle. This is displayed in the  form
              Dd+HH:MM:SS.msec  where D is the number of days, HH is hours, MM
              is minutes, SS is seconds and msec is milliseconds.  [Note: this
              time  stamp wraps after 2^32 milliseconds, or 49 days 17 hours 2
              minutes and 47.296 seconds.]  The key  ATA  disk  registers  are
              also  recorded in the log.  The final column of the error log is
              a text-string description of the ATA command defined by the Com-
              mand  Register  (CR) and Feature Register (FR) values.  Commands
              that are obsolete in the most current spec are listed like this:
              READ LONG (w/ retry) [OBS-4], indicating that the command became
              obsolete with or in the  ATA-4  specification.   Similarly,  the
              notation  [RET-N] is used to indicate that a command was retired
              in the ATA-N specification.  Some commands are  not  defined  in
              any version of the ATA specification but are in common use none-
              theless; these are marked [NS], meaning non-standard.

              The ATA Specification (ATA  ACS-2  Revision  7,  Section  A.7.1)
              says: "Error log data structures shall include, but are not lim-
              ited to, Uncorrectable errors, ID Not Found errors for which the
              LBA  requested  was valid, servo errors, and write fault errors.
              Error log data structures shall not include errors attributed to
              the receipt of faulty commands."  The definitions of these terms
              are:
              UNC (UNCorrectable): data is uncorrectable.  This refers to data
              which  has  been  read  from  the  disk, but for which the Error
              Checking  and  Correction  (ECC)  codes  are  inconsistent.   In
              effect, this means that the data can not be read.
              IDNF (ID Not Found): user-accessible address could not be found.
              For READ LOG type commands, IDNF can also indicate that a device
              data log structure checksum was incorrect.

              If  the  command  that caused the error was a READ or WRITE com-
              mand, then the Logical Block Address (LBA) at  which  the  error
              occurred  will  be printed in base 10 and base 16.  The LBA is a
              linear address, which  counts  512-byte  sectors  on  the  disk,
              starting  from  zero.   (Because of the limitations of the SMART
              error log, if the LBA is greater than 0xfffffff, then either  no
              error  log  entry will be made, or the error log entry will have
              an incorrect LBA. This may happen for  drives  with  a  capacity
              greater  than 128 GiB or 137 GB.) On Linux systems the smartmon-
              tools web page has instructions about how  to  convert  the  LBA
              address  to  the  name of the disk file containing the erroneous
              disk sector.

              Please note that some manufacturers ignore  the  ATA  specifica-
              tions,  and make entries in the error log if the device receives
              a command which is not implemented or is not valid.

              error - [SCSI] prints the error counter  log  pages  for  reads,
              write  and verifies.  The verify row is only output if it has an
              element other than zero.

              xerror[,NUM][,error] - [ATA only] prints the Extended Comprehen-
              sive SMART error log (General Purpose Log address 0x03).  Unlike
              the Summary SMART error log (see '-l error' above), it  provides
              sufficient  space to log the contents of the 48-bit LBA register
              set introduced with ATA-6.  It also supports logs with more than
              one  sector.   Each sector holds up to 4 log entries. The actual
              number of log sectors is vendor specific.

              Only the 8 most recent error log entries are printed by default.
              This number can be changed by the optional parameter NUM.

              If  ',error'  is  appended  and the Extended Comprehensive SMART
              error log is not supported, the Summary SMART self-test  log  is
              printed.

              Please  note  that  recent  drives may report errors only in the
              Extended Comprehensive SMART error log.  The Summary SMART error
              log may be reported as supported but is always empty then.

              selftest - [ATA] prints the SMART self-test log.  The disk main-
              tains a self-test log showing the results  of  the  self  tests,
              which  can  be  run  using the '-t' option described below.  For
              each of the most recent twenty-one self-tests, the log shows the
              type  of  test  (short or extended, off-line or captive) and the
              final status of the test.  If the test did not complete success-
              fully,  then the percentage of the test remaining is shown.  The
              time at which the test took place, measured  in  hours  of  disk
              lifetime,  is  also  printed. [Note: this time stamp wraps after
              2^16 hours, or 2730 days and 16 hours, or about 7.5  years.]  If
              any errors were detected, the Logical Block Address (LBA) of the
              first error is printed in decimal notation.   On  Linux  systems
              the smartmontools web page has instructions about how to convert
              this LBA address to the name of the  disk  file  containing  the
              erroneous block.

              selftest  -  [SCSI]  the  self-test  log for a SCSI device has a
              slightly different format than for an ATA device.  For  each  of
              the most recent twenty self-tests, it shows the type of test and
              the status (final or in progress) of the  test.  SCSI  standards
              use  the  terms "foreground" and "background" (rather than ATA's
              corresponding "captive" and "off-line") and "short"  and  "long"
              (rather  than  ATA's  corresponding  "short"  and "extended") to
              describe the type of the test.  The printed  segment  number  is
              only  relevant when a test fails in the third or later test seg-
              ment.  It identifies the test that failed and consists of either
              the  number  of  the segment that failed during the test, or the
              number of the test that failed and the number of the segment  in
              which  the  test  was  run,  using  a  vendor-specific method of
              putting both numbers into a  single  byte.   The  Logical  Block
              Address (LBA) of the first error is printed in hexadecimal nota-
              tion.  On Linux systems the smartmontools web page has  instruc-
              tions  about  how to convert this LBA address to the name of the
              disk file containing the erroneous block.  If provided, the SCSI
              Sense Key (SK), Additional Sense Code (ASC) and Additional Sense
              Code Qualifier (ASQ) are also printed. The self tests can be run
              using the '-t' option described below (using the ATA test termi-
              nology).

              xselftest[,NUM][,selftest] -  [ATA  only]  prints  the  Extended
              SMART  self-test  log (General Purpose Log address 0x07). Unlike
              the SMART self-test log (see '-l selftest' above),  it  supports
              48-bit  LBA  and  logs  with  more than one sector.  Each sector
              holds up to 19 log entries. The actual number of log sectors  is
              vendor specific.

              Only the 25 most recent log entries are printed by default. This
              number can be changed by the optional parameter NUM.

              If ',selftest' is appended and the Extended SMART self-test  log
              is not supported, the old SMART self-test log is printed.

              selective  -  [ATA only] Please see the '-t select' option below
              for a description of selective self-tests.  The selective  self-
              test  log  shows  the start/end Logical Block Addresses (LBA) of
              each of the five test spans, and their current test status.   If
              the  span  is being tested or the remainder of the disk is being
              read-scanned, the  current  65536-sector  block  of  LBAs  being
              tested  is  also  displayed.   The  selective self-test log also
              shows if a read-scan of the remainder of the disk will  be  car-
              ried  out  after  the selective self-test has completed (see '-t
              afterselect' option) and the time delay before  restarting  this
              read-scan if it is interrupted (see '-t pending' option).

              directory[,gs]  -  [ATA only] if the device supports the General
              Purpose Logging feature set (ATA-6 and above) then  this  prints
              the  Log  Directory  (the  log at address 0).  The Log Directory
              shows what logs are available and their length in  sectors  (512
              bytes).   The  contents  of the logs at address 1 [Summary SMART
              error log] and at address 6 [SMART self-test log] may be printed
              using  the  previously-described error and selftest arguments to
              this option.  If your version of smartctl  supports  48-bit  ATA
              commands,  both the General Purpose Log (GPL) and SMART Log (SL)
              directories are printed in one combined table. The output can be
              restricted  to  the  GPL directory or SL directory by '-l direc-
              tory,q' or '-l directory,s' respectively.

              background - [SCSI only] the background scan results log outputs
              information derived from Background Media Scans (BMS) done after
              power up and/or periodically (e.g. every  24  hours)  on  recent
              SCSI  disks. If supported, the BMS status is output first, indi-
              cating whether a background scan is currently underway  (and  if
              so  a progress percentage), the amount of time the disk has been
              powered up and the number of scans already completed. Then there
              is  a  header and a line for each background scan "event". These
              will typically be either recovered or unrecoverable errors. That
              latter  group may need some attention. There is a description of
              the background scan mechanism in section 4.18 of SBC-3  revision
              6 (see www.t10.org ).

              scttemp,  scttempsts,  scttemphist  - [ATA only] prints the disk
              temperature information provided by the SMART Command  Transport
              (SCT) commands.  The option 'scttempsts' prints current tempera-
              ture and temperature ranges returned by the SCT Status  command,
              'scttemphist' prints temperature limits and the temperature his-
              tory table returned by the SCT Data Table command, and 'scttemp'
              prints  both.  The temperature values are preserved across power
              cycles.  The logging interval can be  configured  with  the  '-l
              scttempint,N[,p]'  option,  see  below.   The  SCT commands were
              introduced in ATA8-ACS and were also  supported  by  many  ATA-7
              disks.

              scttempint,N[,p] - [ATA only] clears the SCT temperature history
              table and sets the time interval for temperature  logging  to  N
              minutes.   If ',p' is specified, the setting is preserved across
              power cycles.  Otherwise, the setting is volatile  and  will  be
              reverted  to  the  last  non-volatile  setting  by the next hard
              reset.  The default interval is vendor specific, typical  values
              are 1, 2, or 5 minutes.

              scterc[,READTIME,WRITETIME]  -  [ATA  only]  prints  values  and
              descriptions of the SCT Error Recovery Control  settings.  These
              are  equivalent  to  TLER (as used by Western Digital), CCTL (as
              used by Samsung and Hitachi/HGST) and ERC (as used by  Seagate).
              READTIME and WRITETIME arguments (deciseconds) set the specified
              values. Values of 0 disable the feature, other values less  than
              65  are probably not supported. For RAID configurations, this is
              typically set to 70,70 deciseconds.

              devstat[,PAGE] - [ATA only] prints values  and  descriptions  of
              the ATA Device Statistics log pages (General Purpose Log address
              0x04).  If no PAGE number is specified, entries  from  all  sup-
              ported  pages  are printed.  If PAGE 0 is specified, the list of
              supported pages is printed.  Device Statistics was introduced in
              ACS-2 and is only supported by some recent devices.

              sataphy[,reset]  - [SATA only] prints values and descriptions of
              the SATA Phy Event Counters (General Purpose Log address  0x11).
              If '-l sataphy,reset' is specified, all counters are reset after
              reading the values.  This  also  works  for  SATA  devices  with
              Packet interface like CD/DVD drives.

              sasphy[,reset]  -  [SAS  (SCSI) only] prints values and descrip-
              tions of the SAS (SSP) Protocol  Specific  log  page  (log  page
              0x18).   If  '-l  sasphy,reset'  is  specified, all counters are
              reset after reading the values.

              gplog,ADDR[,FIRST[-LAST|+SIZE]] - [ATA only] prints a  hex  dump
              of any log accessible via General Purpose Logging (GPL) feature.
              The log address ADDR is the hex address listed in the log direc-
              tory  (see  '-l  directory'  above).   The  range of log sectors
              (pages)  can  be  specified  by  decimal  values  FIRST-LAST  or
              FIRST+SIZE.   FIRST defaults to 0, SIZE defaults to 1.  LAST can
              be set to 'max' to specify the last page of the log.

              smartlog,ADDR[,FIRST[-LAST|+SIZE]] - [ATA  only]  prints  a  hex
              dump  of any log accessible via SMART Read Log command.  See '-l
              gplog,...' above for parameter syntax.

              For example, all these commands:
                smartctl -l gplog,0x80,10-15 /dev/sda
                smartctl -l gplog,0x80,10+6 /dev/sda
                smartctl -l smartlog,0x80,10-15 /dev/sda
              print pages 10-15 of log 0x80 (first host vendor specific log).

              The hex dump format is compatible with  the  'xxd  -r'  command.
              This command:
                smartctl -l gplog,0x11 /dev/sda | grep ^0 | xxd -r >log.bin
              writes  a binary representation of the one sector log 0x11 (SATA
              Phy Event Counters) to file log.bin.

              ssd - [ATA] prints the Solid State Device Statistics  log  page.
              This has the same effect as '-l devstat,7', see above.

              ssd  -  [SCSI]  prints  the  Solid  State  Media percentage used
              endurance indicator. A value of 0  indicates  as  new  condition
              while  100 indicates the device is at the end of its lifetime as
              projected by the manufacturer. The value may reach 255.

       -v   ID,FORMAT[:BYTEORDER][,NAME],   --vendorattribute=ID,FORMAT[:BYTE-
       ORDER][,NAME]
              [ATA  only]  Sets  a  vendor-specific raw value print FORMAT, an
              optional BYTEORDER and an optional NAME for Attribute ID.   This
              option may be used multiple times.

              The  Attribute ID can be in the range 1 to 255. If 'N' is speci-
              fied as ID, the settings for all Attributes are changed.

              The optional BYTEORDER consists of 1 to 8  characters  from  the
              set '012345rvwz'. The characters '0' to '5' select the byte 0 to
              5 from the 48-bit raw value, 'r' selects the  reserved  byte  of
              the  attribute data block, 'v' selects the normalized value, 'w'
              selects the worst value  and  'z'  inserts  a  zero  byte.   The
              default  BYTEORDER is '543210' for all 48-bit formats, 'r543210'
              for the 54-bit formats, and '543210wv' for the  64-bit  formats.
              For  example,  '-v  5,raw48:012345'  prints  the  raw  value  of
              attribute 5 with big endian instead of little endian byte order-
              ing.

              The  NAME  is  a  string of letters, digits and underscore.  Its
              length should not exceed 23 characters.  The '-P showall' option
              reports an error if this is the case.

              -v  help  -  Prints (to STDOUT) a list of all valid arguments to
              this option, then exits.

              Valid arguments for FORMAT are:

              raw8 - Print the Raw value as six 8-bit unsigned  base-10  inte-
              gers.   This  may  be useful for decoding the meaning of the Raw
              value.

              raw16 - Print the Raw value as  three  16-bit  unsigned  base-10
              integers.   This  may  be useful for decoding the meaning of the
              Raw value.

              raw48 - Print the Raw value as a 48-bit unsigned  base-10  inte-
              ger.  This is the default for most attributes.

              hex48  -  Print  the Raw value as a 12 digit hexadecimal number.
              This may be useful for decoding the meaning of the Raw value.

              raw56 - Print the Raw value as a 54-bit unsigned  base-10  inte-
              ger.   This  includes the reserved byte which follows the 48-bit
              raw value.

              hex56 - Print the Raw value as a 14  digit  hexadecimal  number.
              This  includes  the  reserved  byte which follows the 48-bit raw
              value.

              raw64 - Print the Raw value as a 64-bit unsigned  base-10  inte-
              ger.   This  includes  two  bytes  from the normalized and worst
              attribute value.  This raw format is used by  some  SSD  devices
              with Indilinx controller.

              hex64  -  Print  the Raw value as a 16 digit hexadecimal number.
              This includes two bytes from the normalized and worst  attribute
              value.   This raw format is used by some SSD devices with Indil-
              inx controller.

              min2hour - Raw Attribute is power-on time in minutes.   Its  raw
              value  will  be displayed in the form "Xh+Ym".  Here X is hours,
              and Y is minutes in the  range  0-59  inclusive.   Y  is  always
              printed with two digits, for example "06" or "31" or "00".

              sec2hour  -  Raw Attribute is power-on time in seconds.  Its raw
              value will be displayed in  the  form  "Xh+Ym+Zs".   Here  X  is
              hours,  Y  is minutes in the range 0-59 inclusive, and Z is sec-
              onds in the range 0-59 inclusive.  Y and Z  are  always  printed
              with two digits, for example "06" or "31" or "00".

              halfmin2hour - Raw Attribute is power-on time, measured in units
              of 30 seconds.  This format is used by some Samsung disks.   Its
              raw  value  will  be  displayed  in the form "Xh+Ym".  Here X is
              hours, and Y is minutes in  the  range  0-59  inclusive.   Y  is
              always  printed  with  two  digits,  for example "06" or "31" or
              "00".

              msec24hour32 - Raw Attribute is power-on time measured in 32-bit
              hours  and  24-bit milliseconds since last hour update.  It will
              be displayed in the form "Xh+Ym+Z.Ms".  Here X is  hours,  Y  is
              minutes, Z is seconds and M is milliseconds.

              tempminmax  -  Raw Attribute is the disk temperature in Celsius.
              Info about Min/Max temperature is printed if available.  This is
              the  default for Attributes 190 and 194.  The recording interval
              (lifetime, last power cycle, last soft  reset)  of  the  min/max
              values is device specific.

              temp10x  -  Raw  Attribute  is ten times the disk temperature in
              Celsius.

              raw16(raw16) - Print the raw attribute as a 16-bit value and two
              optional  16-bit values if these words are nonzero.  This is the
              default for Attributes 5 and 196.

              raw16(avg16) - Raw attribute is spin-up time.  It is printed  as
              a  16-bit  value  and  an optional "Average" 16-bit value if the
              word is nonzero.  This is the default for Attribute 3.

              raw24(raw8) - Print the raw attribute  as  a  24-bit  value  and
              three optional 8-bit values if these bytes are nonzero.  This is
              the default for Attribute 9.

              raw24/raw24 - Raw Attribute  contains  two  24-bit  values.  The
              first is the number of load cycles.  The second is the number of
              unload cycles.  The difference between these two values  is  the
              number  of  times  that  the  drive was unexpectedly powered off
              (also called an emergency unload).  As  a  rule  of  thumb,  the
              mechanical  stress created by one emergency unload is equivalent
              to that created by one hundred normal unloads.

              raw24/raw32 - Raw attribute is an error rate which consists of a
              24-bit error count and a 32-bit total count.

              The following old arguments to '-v' are also still valid:

              9,minutes - same as: 9,min2hour,Power_On_Minutes.

              9,seconds - same as: 9,sec2hour,Power_On_Seconds.

              9,halfminutes - same as: 9,halfmin2hour,Power_On_Half_Minutes.

              9,temp - same as: 9,tempminmax,Temperature_Celsius.

              192,emergencyretractcyclect          -          same         as:
              192,raw48,Emerg_Retract_Cycle_Ct

              193,loadunload - same as: 193,raw24/raw24.

              194,10xCelsius - same as: 194,temp10x,Temperature_Celsius_x10.

              194,unknown - same as: 194,raw48,Unknown_Attribute.

              197,increasing - same as: 197,raw48,Total_Pending_Sectors.  Also
              means  that  Attribute number 197 (Current Pending Sector Count)
              is not reset  if  uncorrectable  sectors  are  reallocated  (see
              smartd.conf(5) man page).

              198,increasing  -  same  as:  198,raw48,Total_Offl_Uncorrectabl.
              Also means that Attribute number 198 (Offline Uncorrectable Sec-
              tor Count) is not reset if uncorrectable sectors are reallocated
              (see smartd.conf(5) man page).

              198,offlinescanuncsectorct    -    same    as:    198,raw48,Off-
              line_Scan_UNC_SectCt.

              200,writeerrorcount - same as: 200,raw48,Write_Error_Count.

              201,detectedtacount - same as: 201,raw48,Detected_TA_Count.

              220,temp - same as: 220,tempminmax,Temperature_Celsius.

       -F TYPE, --firmwarebug=TYPE
              [ATA  only]  Modifies the behavior of smartctl to compensate for
              some known and understood device firmware or driver  bug.   This
              option may be used multiple times.  The valid arguments are:

              none  - Assume that the device firmware obeys the ATA specifica-
              tions.  This is the default, unless the device has  presets  for
              '-F'  in  the  drive database.  Using this option on the command
              line will override any preset values.

              nologdir - Suppresses read attempts of SMART or  GP  Log  Direc-
              tory.   Support  for  all  standard  logs  is assumed without an
              actual check.  Some Intel SSDs may freeze if log  address  0  is
              read.

              samsung - In some Samsung disks (example: model SV4012H Firmware
              Version: RM100-08) some of the two- and four-byte quantities  in
              the  SMART data structures are byte-swapped (relative to the ATA
              specification).  Enabling this option tells smartctl to evaluate
              these  quantities  in byte-reversed order.  Some signs that your
              disk needs this option are (1) no self-test  log  printed,  even
              though  you  have  run self-tests; (2) very large numbers of ATA
              errors reported in the ATA error log; (3) strange and impossible
              values for the ATA error log timestamps.

              samsung2  -  In  some  Samsung  disks  the  number of ATA errors
              reported is byte swapped.  Enabling this option  tells  smartctl
              to  evaluate this quantity in byte-reversed order. An indication
              that your Samsung disk needs this option is that  the  self-test
              log  is  printed correctly, but there are a very large number of
              errors in the SMART error log.  This is because the error  count
              is  byte  swapped.   Thus  a disk with five errors (0x0005) will
              appear to have 20480 errors (0x5000).

              samsung3 - Some Samsung disks (at least  SP2514N  with  Firmware
              VF100-37) report a self-test still in progress with 0% remaining
              when the test was already completed. Enabling this option  modi-
              fies  the  output of the self-test execution status (see options
              '-c' or '-a' above) accordingly.

              xerrorlba - Fixes LBA byte ordering  in  Extended  Comprehensive
              SMART  error  log.   Some  disks use little endian byte ordering
              instead of ATA register ordering to specifiy the  LBA  addresses
              in the log entries.

              swapid  -  Fixes byte swapped ATA identify strings (device name,
              serial number, firmware version) returned by some  buggy  device
              drivers.

       -P TYPE, --presets=TYPE
              [ATA  only]  Specifies  whether  smartctl  should use any preset
              options that are available for this drive. By  default,  if  the
              drive is recognized in the smartmontools database, then the pre-
              sets are used.

              The argument show will show any preset options  for  your  drive
              and  the  argument  showall  will  show  all known drives in the
              smartmontools database, along with  their  preset  options.   If
              there  are  no presets for your drive and you think there should
              be (for example, a -v or -F option is needed to get smartctl  to
              display  correct  values)  then please contact the smartmontools
              developers so that this information can be added to  the  smart-
              montools  database.   Contact  information is at the end of this
              man page.

              The valid arguments to this option are:

              use - if a drive is recognized, then use the stored presets  for
              it.   This  is  the default. Note that presets will NOT override
              additional Attribute interpretation ('-v N,something')  command-
              line options or explicit '-F' command-line options..

              ignore - do not use presets.

              show  -  show if the drive is recognized in the database, and if
              so, its presets, then exit.

              showall - list all recognized drives, and the presets  that  are
              set  for  them,  then exit.  This also checks the drive database
              regular expressions and settings for syntax errors.

              The '-P showall' option takes up to two  optional  arguments  to
              match a specific drive type and firmware version. The command:
                smartctl -P showall
              lists all entries, the command:
                smartctl -P showall 'MODEL'
              lists all entries matching MODEL, and the command:
                smartctl -P showall 'MODEL' 'FIRMWARE'
              lists  all  entries  for this MODEL and a specific FIRMWARE ver-
              sion.

       -B [+]FILE, --drivedb=[+]FILE
              [ATA only] Read the drive database from FILE.  The new  database
              replaces the built in database by default.  If '+' is specified,
              then the new entries prepend the built in entries.

              Optional entries are read from the file /etc/smart_drivedb.h  if
              this option is not specified.

              If  /usr/share/smartmontools/drivedb.h  is present, the contents
              of this file is used instead of the built in table.

              Run /usr/sbin/update-smart-drivedb to update this file from  the
              smartmontools SVN repository.

              The  database  files  use  the same C/C++ syntax that is used to
              initialize the built in database array. C/C++ style comments are
              allowed.  Example:

                /* Full entry: */
                {
                  "Model family",    // Info about model family/series.
                  "MODEL1.*REGEX",   // Regular expression to match model of device.
                  "VERSION.*REGEX",  // Regular expression to match firmware version(s).
                  "Some warning",    // Warning message.
                  "-v 9,minutes"     // String of preset -v and -F options.
                },
                /* Minimal entry: */
                {
                  "",                // No model family/series info.
                  "MODEL2.*REGEX",   // Regular expression to match model of device.
                  "",                // All firmware versions.
                  "",                // No warning.
                  ""                 // No options preset.
                },
                /* USB ID entry: */
                {
                  "USB: Device; Bridge", // Info about USB device and bridge name.
                  "0x1234:0xabcd",   // Regular expression to match vendor:product ID.
                  "0x0101",          // Regular expression to match bcdDevice.
                  "",                // Not used.
                  "-d sat"           // String with device type option.
                },
                /* ... */


       SMART RUN/ABORT OFFLINE TEST AND self-test OPTIONS:

       -t TEST, --test=TEST
              Executes  TEST immediately.  The '-C' option can be used in con-
              junction with this option to run the short or long (and also for
              ATA devices, selective or conveyance) self-tests in captive mode
              (known as "foreground mode" for SCSI devices).  Note  that  only
              one test type can be run at a time, so only one test type should
              be specified per command line.  Note also that if a computer  is
              shutdown  or  power  cycled  during  a self-test, no harm should
              result.  The self-test will either be  aborted  or  will  resume
              automatically.

              All  '-t TEST' commands can be given during normal system opera-
              tion unless captive mode ('-C' option) is used.  A running self-
              test  can,  however, degrade performance of the drive.  Frequent
              I/O requests from the operating system increase the duration  of
              a test.  These impacts may vary from device to device.

              If  a  test  failure  occurs then the device may discontinue the
              testing and report the result immediately.

              The valid arguments to this option are:

              offline - [ATA] runs SMART Immediate Offline Test.  This immedi-
              ately  starts  the  test  described  above.  This command can be
              given during normal system operation.  The effects of this  test
              are  visible only in that it updates the SMART Attribute values,
              and if errors are found they will appear in the SMART error log,
              visible with the '-l error' option.

              If  the  '-c'  option  to smartctl shows that the device has the
              "Suspend Offline collection upon new  command"  capability  then
              you  can  track the progress of the Immediate Offline test using
              the '-c' option to smartctl.  If the '-c' option show  that  the
              device has the "Abort Offline collection upon new command" capa-
              bility then most commands will abort the Immediate Offline Test,
              so  you  should  not  try to track the progress of the test with
              '-c', as it will abort the test.

              offline - [SCSI] runs the default self test  in  foreground.  No
              entry is placed in the self test log.

              short - [ATA] runs SMART Short Self Test (usually under ten min-
              utes).  This command can be given during normal system operation
              (unless  run in captive mode - see the '-C' option below).  This
              is a test in a different category than the  immediate  or  auto-
              matic  offline tests.  The "Self" tests check the electrical and
              mechanical performance as well as the read  performance  of  the
              disk.   Their  results  are reported in the Self Test Error Log,
              readable with the '-l selftest' option.  Note that on some disks
              the  progress of the self-test can be monitored by watching this
              log during the self-test; with other disks use the  '-c'  option
              to monitor progress.

              short - [SCSI] runs the "Background short" self-test.

              long  -  [ATA]  runs SMART Extended Self Test (tens of minutes).
              This is a longer and more thorough version  of  the  Short  Self
              Test  described above.  Note that this command can be given dur-
              ing normal system operation (unless run in captive  mode  -  see
              the '-C' option below).

              long - [SCSI] runs the "Background long" self-test.

              conveyance  - [ATA only] runs a SMART Conveyance Self Test (min-
              utes).  This self-test routine is intended  to  identify  damage
              incurred  during transporting of the device. This self-test rou-
              tine should take on the order of minutes to complete.  Note that
              this command can be given during normal system operation (unless
              run in captive mode - see the '-C' option below).

              select,N-M, select,N+SIZE - [ATA only] runs  a  SMART  Selective
              Self  Test,  to  test  a  range  of disk Logical Block Addresses
              (LBAs), rather than the entire disk.  Each range of LBAs that is
              checked  is  called  a "span" and is specified by a starting LBA
              (N) and an ending LBA (M) with N less than or equal  to  M.  The
              range  can  also  be specified as N+SIZE. A span at the end of a
              disk can be specified by N-max.

              For example the commands:
                smartctl -t select,10-20 /dev/sda
                smartctl -t select,10+11 /dev/sda
              both runs a self test on one span  consisting  of  LBAs  ten  to
              twenty (inclusive). The command:
                smartctl -t select,100000000-max /dev/sda
              run  a  self  test from LBA 100000000 up to the end of the disk.
              The '-t' option can be given up to five times,  to  test  up  to
              five spans.  For example the command:
                smartctl -t select,0-100 -t select,1000-2000 /dev/sda
              runs  a  self test on two spans.  The first span consists of 101
              LBAs and the second span consists of 1001 LBAs.  Note  that  the
              spans can overlap partially or completely, for example:
                smartctl -t select,0-10 -t select,5-15 -t select,10-20 /dev/sda
              The  results  of  the  selective self-test can be obtained (both
              during and after the test) by printing the SMART self-test  log,
              using the '-l selftest' option to smartctl.

              Selective  self tests are particularly useful as disk capacities
              increase: an extended self test (smartctl -t long) can take sev-
              eral  hours.  Selective self-tests are helpful if (based on SYS-
              LOG error messages, previous failed self-tests, or  SMART  error
              log  entries)  you  suspect  that a disk is having problems at a
              particular range of Logical Block Addresses (LBAs).

              Selective self-tests can be run during normal  system  operation
              (unless done in captive mode - see the '-C' option below).

              The  following  variants  of the selective self-test command use
              spans based on the ranges from past tests already stored on  the
              disk:

              select,redo[+SIZE]  -  [ATA  only] redo the last SMART Selective
              Self Test using the same LBA range. The starting LBA is  identi-
              cal  to  the LBA used by last test, same for ending LBA unless a
              new span size is specified by optional +SIZE argument.

              For example the commands:
                smartctl -t select,10-20 /dev/sda
                smartctl -t select,redo /dev/sda
                smartctl -t select,redo+20 /dev/sda
              have the same effect as:
                smartctl -t select,10-20 /dev/sda
                smartctl -t select,10-20 /dev/sda
                smartctl -t select,10-29 /dev/sda

              select,next[+SIZE] - [ATA only] runs a SMART Selective Self Test
              on  the  LBA range which follows the range of the last test. The
              starting LBA is set to (ending LBA +1) of the last test.  A  new
              span size may be specified by the optional +SIZE argument.

              For example the commands:
                smartctl -t select,0-999 /dev/sda
                smartctl -t select,next /dev/sda
                smartctl -t select,next+2000 /dev/sda
              have the same effect as:
                smartctl -t select,0-999 /dev/sda
                smartctl -t select,1000-1999 /dev/sda
                smartctl -t select,2000-3999 /dev/sda

              If  the  last  test  ended  at the last LBA of the disk, the new
              range starts at LBA 0. The span size of the last span of a  disk
              is  adjusted  such  that  the total number of spans to check the
              full  disk  will  not  be  changed  by  future   uses   of   '-t
              select,next'.

              select,cont[+SIZE] - [ATA only] performs a 'redo' (above) if the
              self test status reports that the last test was aborted  by  the
              host. Otherwise it run the 'next' (above) test.

              afterselect,on - [ATA only] perform an offline read scan after a
              Selective self-test has completed.  This  option  must  be  used
              together  with  one  or more of the select,N-M options above. If
              the LBAs that have been specified  in  the  Selective  self-test
              pass the test with no errors found, then read scan the remainder
              of the disk.  If the device is powered-cycled  while  this  read
              scan is in progress, the read scan will be automatically resumed
              after a time specified by the pending timer  (see  below).   The
              value of this option is preserved between selective self-tests.

              afterselect,off  -  [ATA only] do not read scan the remainder of
              the disk after a Selective self-test has completed.  This option
              must  be use together with one or more of the select,N-M options
              above.  The value of this option is preserved between  selective
              self-tests.

              pending,N  -  [ATA only] set the pending offline read scan timer
              to N minutes.  Here N is an integer in the range from 0 to 65535
              inclusive.   If  the  device  is  powered off during a read scan
              after a Selective self-test, then resume the test  automatically
              N minutes after power-up.  This option must be use together with
              one or more of the select,N-M options above. The value  of  this
              option is preserved between selective self-tests.

              vendor,N  - [ATA only] issues the ATA command SMART EXECUTE OFF-
              LINE IMMEDIATE with subcommand N in LBA LOW register.  The  sub-
              command  is  specified as a hex value in the range 0x00 to 0xff.
              Subcommands 0x40-0x7e and 0x90-0xff are reserved for vendor spe-
              cific  use,  see  table 61 of T13/1699-D Revision 6a (ATA8-ACS).
              Note that the subcommands 0x00-0x04,0x7f,0x81-0x84 are supported
              by  other  smartctl  options (e.g. 0x01: '-t short', 0x7f: '-X',
              0x82: '-C -t long').

              WARNING: Only run subcommands documented by the  vendor  of  the
              device.

              Example  for some Intel SSDs only: The subcommand 0x40 ('-t ven-
              dor,0x40') clears the timed workload  related  SMART  attributes
              (226,  227,  228).  Note that the raw values of these attributes
              are held at 65535 (0xffff) until the workload timer  reaches  60
              minutes.

              force - start new self-test even if another test is already run-
              ning.  By default a running self-test will not be interrupted to
              begin another test.

       -C, --captive
              [ATA]  Runs self-tests in captive mode.  This has no effect with
              '-t offline' or if the '-t' option is not used.

              WARNING: Tests run in captive mode may busy out  the  drive  for
              the  length of the test.  Only run captive tests on drives with-
              out any mounted partitions!

              [SCSI] Runs the self-test in "Foreground" mode.

       -X, --abort
              Aborts non-captive SMART Self Tests.   Note  that  this  command
              will  abort the Offline Immediate Test routine only if your disk
              has the "Abort Offline collection upon new command" capability.


ATA, SCSI command sets and SAT
       In the past there has been a clear distinction between storage  devices
       that  used  the  ATA  and SCSI command sets. This distinction was often
       reflected in their device naming and hardware. Now various SCSI  trans-
       ports  (e.g.  SAS,  FC  and  iSCSI) can interconnect to both SCSI disks
       (e.g. FC and SAS) and ATA disks (especially SATA). USB  and  IEEE  1394
       storage  devices  use the SCSI command set externally but almost always
       contain ATA or SATA disks (or flash). The storage  subsystems  in  some
       operating  systems  have  started to remove the distinction between ATA
       and SCSI in their device naming policies.

       99% of operations that an OS  performs  on  a  disk  involve  the  SCSI
       INQUIRY,  READ  CAPACITY, READ and WRITE commands, or their ATA equiva-
       lents. Since the SCSI commands are slightly more general than their ATA
       equivalents,  many  OSes  are generating SCSI commands (mainly READ and
       WRITE) and letting a lower level translate them to  their  ATA  equiva-
       lents  as the need arises. An important note here is that "lower level"
       may be in external equipment and hence outside the control of an OS.

       SCSI to ATA Translation (SAT) is a standard (ANSI INCITS 431-2007) that
       specifies  how this translation is done. For the other 1% of operations
       that an OS performs on a disk, SAT provides two options.  First  is  an
       optional  ATA  PASS-THROUGH  SCSI command (there are two variants). The
       second is a translation from the closest  SCSI  command.  Most  current
       interest is in the "pass-through" option.

       The  relevance to smartmontools (and hence smartctl) is that its inter-
       actions with disks fall solidly into the "1%" category. So even if  the
       OS  can  happily treat (and name) a disk as "SCSI", smartmontools needs
       to detect the native command set and act accordingly.  As more  storage
       manufacturers  (including external SATA drives) comply with SAT, smart-
       montools is able to automatically distinguish the native command set of
       the  device. In some cases the '-d sat' option is needed on the command
       line.

       There are also virtual disks which typically have no useful information
       to  convey  to  smartmontools,  but could conceivably in the future. An
       example of a virtual disk is the OS's view of a RAID 1 box.  There  are
       most  likely  two SATA disks inside a RAID 1 box. Addressing those SATA
       disks from a distant OS  is  a  challenge  for  smartmontools.  Another
       approach  is  running  a  tool like smartmontools inside the RAID 1 box
       (e.g.  a Network Attached Storage (NAS) box) and fetching the logs  via
       a browser.


EXAMPLES
       smartctl -a /dev/sda
       Print a large amount of SMART information for drive /dev/sda .

       smartctl -s off /dev/sdd
       Disable SMART monitoring and data log collection on drive /dev/sdd .

       smartctl --smart=on --offlineauto=on --saveauto=on /dev/sda
       Enable  SMART on drive /dev/sda, enable automatic offline testing every
       four hours, and enable autosaving of SMART Attributes.  This is a  good
       start-up line for your system's init files.  You can issue this command
       on a running system.

       smartctl -t long /dev/sdc
       Begin an extended self-test of drive /dev/sdc.  You can issue this com-
       mand on a running system.  The results can be seen in the self-test log
       visible with the '-l selftest' option after it has completed.

       smartctl -s on -t offline /dev/sda
       Enable SMART on the disk, and begin an immediate offline test of  drive
       /dev/sda.  You can issue this command on a running system.  The results
       are only used to update the SMART Attributes,  visible  with  the  '-A'
       option.  If any device errors occur, they are logged to the SMART error
       log, which can be seen with the '-l error' option.

       smartctl -A -v 9,minutes /dev/sda
       Shows the vendor Attributes, when the disk  stores  its  power-on  time
       internally in minutes rather than hours.

       smartctl -q errorsonly -H -l selftest /dev/sda
       Produces  output only if the device returns failing SMART status, or if
       some of the logged self-tests ended with errors.

       smartctl -q silent -a /dev/sda
       Examine all SMART data for device /dev/sda, but produce no printed out-
       put.  You must use the exit status (the $?  shell variable) to learn if
       any Attributes are out of bound, if the SMART  status  is  failing,  if
       there  are errors recorded in the self-test log, or if there are errors
       recorded in the disk error log.

       smartctl -a -d 3ware,0 /dev/sda
       Examine all SMART data for the first ATA disk connected to a 3ware RAID
       controller card.

       smartctl -a -d 3ware,0 /dev/twe0
       Examine all SMART data for the first ATA disk connected to a 3ware RAID
       6000/7000/8000 controller card.

       smartctl -a -d 3ware,0 /dev/twa0
       Examine all SMART data for the first ATA disk connected to a 3ware RAID
       9000 controller card.

       smartctl -a -d 3ware,0 /dev/twl0
       Examine all SMART data for the first SATA (not SAS) disk connected to a
       3ware RAID 9750 controller card.

       smartctl -t short -d 3ware,3 /dev/sdb
       Start a short self-test on the fourth ATA disk connected to  the  3ware
       RAID controller card which is the second SCSI device /dev/sdb.

       smartctl -t long -d areca,4 /dev/sg2
       Start  a  long  self-test on the fourth SATA disk connected to an Areca
       RAID controller addressed by /dev/sg2.

       smartctl -a -d hpt,1/3 /dev/sda (under Linux)
       smartctl -a -d hpt,1/3 /dev/hptrr (under FreeBSD)
       Examine all SMART data for the (S)ATA disk directly  connected  to  the
       third channel of the first HighPoint RocketRAID controller card.

       smartctl -t short -d hpt,1/1/2 /dev/sda (under Linux)
       smartctl -t short -d hpt,1/1/2 /dev/hptrr (under FreeBSD)
       Start  a  short self-test on the (S)ATA disk connected to second pmport
       on the first channel of the first HighPoint RocketRAID controller card.

       smartctl -t select,10-100 -t select,30-300 -t afterselect,on -t pending,45 /dev/sda
       Run a selective self-test on LBAs 10 to 100 and 30 to 300.   After  the
       these  LBAs  have been tested, read-scan the remainder of the disk.  If
       the disk is power-cycled during the read-scan, resume the scan 45  min-
       utes after power to the device is restored.

       smartctl -a -d cciss,0 /dev/cciss/c0d0
       Examine  all  SMART  data  for the first SCSI disk connected to a cciss
       RAID controller card.


EXIT STATUS
       The exit statuses of smartctl are defined by a bitmask.  If all is well
       with  the  disk,  the  exit status (return value) of smartctl is 0 (all
       bits turned off).  If a problem occurs, or an error,  potential  error,
       or  fault  is  detected,  then  a non-zero status is returned.  In this
       case, the eight different bits in the exit status  have  the  following
       meanings  for  ATA disks; some of these values may also be returned for
       SCSI disks.

       Bit 0: Command line did not parse.

       Bit 1: Device open failed, device did not  return  an  IDENTIFY  DEVICE
              structure,  or  device  is  in a low-power mode (see '-n' option
              above).

       Bit 2: Some SMART or other ATA command to the disk failed, or there was
              a  checksum  error  in  a  SMART data structure (see '-b' option
              above).

       Bit 3: SMART status check returned "DISK FAILING".

       Bit 4: We found prefail Attributes <= threshold.

       Bit 5: SMART status check returned "DISK OK" but  we  found  that  some
              (usage  or  prefail)  Attributes  have been <= threshold at some
              time in the past.

       Bit 6: The device error log contains records of errors.

       Bit 7: The device self-test log contains records of errors.  [ATA only]
              Failed  self-tests outdated by a newer successful extended self-
              test are ignored.

       To test within the shell for whether or  not  the  different  bits  are
       turned on or off, you can use the following type of construction (which
       should work with any POSIX compatible shell):
       smartstat=$(($? & 8))
       This looks at only at bit 3 of the exit status $?  (since 8=2^3).   The
       shell  variable  $smartstat  will  be  nonzero  if  SMART  status check
       returned "disk failing" and zero otherwise.

       This shell script prints all status bits:
       val=$?; mask=1
       for i in 0 1 2 3 4 5 6 7; do
         echo "Bit $i: $(((val & mask) && 1))"
         mask=$((mask << 1))
       done


FILES
       /usr/sbin/smartctl
              full path of this executable.

       /usr/share/smartmontools/drivedb.h
              drive database (see '-B' option).

       /etc/smart_drivedb.h
              optional local drive database (see '-B' option).


AUTHORS
       Bruce Allen (project initiator),
       Christian Franke  (project  manager,  Windows  port  and  all  sort  of
       things),
       Douglas Gilbert (SCSI subsystem),
       Volker Kuhlmann (moderator of support and database mailing list),
       Gabriele Pohl (wiki & development team support),
       Alex Samorukov (FreeBSD port and more, new Trac wiki).

       Many  other  individuals  have  made contributions and corrections, see
       AUTHORS, ChangeLog and repository files.

       The first smartmontools code was derived from the  smartsuite  package,
       written by Michael Cornwell and Andre Hedrick.


REPORTING BUGS
       To submit a bug report, create a ticket in smartmontools wiki:
       <http://www.smartmontools.org/>.
       Alternatively send the info to the smartmontools support mailing list:
       <https://lists.sourceforge.net/lists/listinfo/smartmontools-support>.



ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       +---------------+------------------------------+
       |ATTRIBUTE TYPE |       ATTRIBUTE VALUE        |
       +---------------+------------------------------+
       |Availability   | system/storage/smartmontools |
       +---------------+------------------------------+
       |Stability      | Volatile                     |
       +---------------+------------------------------+
SEE ALSO
       smartd(8).
       update-smart-drivedb(8).


WARNING
       The  smartctl  utility  accesses  the  internals of your system and its
       incorrect usage may render your system inoperable.


REFERENCES
       Please see the following web site for more  info:  http://www.smartmon-
       tools.org/

       An  introductory  article  about smartmontools is Monitoring Hard Disks
       with SMART, by Bruce Allen, Linux Journal, January 2004,  pages  74-77.
       This is http://www.linuxjournal.com/article/6983 online.

       If  you  would  like  to understand better how SMART works, and what it
       does, a good place to start is with Sections 4.8 and 6.54 of the  first
       volume  of  the  'AT  Attachment with Packet Interface-7' (ATA/ATAPI-7)
       specification Revision 4b.   This  documents  the  SMART  functionality
       which the smartmontools utilities provide access to.

       The  functioning of SMART was originally defined by the SFF-8035i revi-
       sion 2 and the SFF-8055i revision 1.4 specifications.  These are publi-
       cations of the Small Form Factors (SFF) Committee.

       Links  to  these  and other documents may be found on the Links page of
       the smartmontools Wiki at http://www.smartmontools.org/wiki/Links .


PACKAGE VERSION
       smartmontools-6.5 2016-05-07 r4318
       $Id: smartctl.8.in 4311 2016-04-27 21:03:01Z chrfranke $



NOTES
       This    software    was    built    from    source     available     at
       https://github.com/oracle/solaris-userland.    The  original  community
       source was downloaded from   https://sourceforge.net/projects/smartmon-
       tools/files/smartmontools/6.5/smartmontools-6.5.tar.gz

       Further information about this software can be found on the open source
       community website at https://www.smartmontools.org/.



smartmontools-6.5                 2016-05-07                       SMARTCTL(8)